From: Yujie <recrusader@gm...>  20081219 17:38:31

Dear Roy: Sorry for rementioning this problem. I am figuring out how to deal with it. Our problem is about several Systems with different variable numbers. Assuming I have 2N Systems. N Systems (Group 1) in them have p variables and the other N Systems (Group 2) have q variables. Generally, p>q. Because I need to figure out the corresponding relationship beween variables in Group 1 and 2, that is which variables are from the same discretized physical points. Therefore, I am wondering how to do it efficiently. If I know the rules of the Dofs distribution, it should be easy to find their relationship independing on element looping. do you have any comments about this? thanks a lot. Regards, Yujie On Thu, Dec 18, 2008 at 7:53 PM, Roy Stogner <roystgnr@...>wrote: > On Thu, 18 Dec 2008, Yujie wrote: > > Now, I have two System. One has two variables (v1s1,v2s1). The other has >> one >> variable (v1s2). They use the same mesh. In parallel mode, what is the >> ralationship between their dofs? >> To my knowledge, if I use two cpus and use >> the variablemajor mode and the same shape functions >> > > What is your motivation for wanting to secondguess the DoF indexing > to begin with? It's probably not, "I wish my code would break if I > changed one of the variables' approximation orders", so there's got to > be some other problem which you're trying to solve. Whatever that > problem is, there ought to be a better way to solve it. Either > there's a DofObject or DofMap API that can do what you want, and you > should use it... or there isn't such an API, and we should add it. > > that is, assuming the number of mesh points is n1, if I want to get the >> relationship between v1s2 and v1s1 in the second cpu, it should be >> d1_c2_v1s2=d1_c2_v1s1n1, right? thanks a lot. >> > > Independent Systems have independently indexed DoF coefficient > vectors; they overlap. If I'm understanding your notation right, then > d1_c2_v1s2=d1_c2_v1s1. >  > Roy > 